The thousands of troops already deployed to the border could be but the tip of the iceberg of increased cooperation between the Department of Defense and Homeland Security.

"It is recommended that all US Border Patrol agents and DoD personnel working along the border report any sighting of drones to their respective leadership staff and the EPT-IOC," it said.

Border security:US troops arrive at Fort Bliss for training ahead of border deployment The border shooting occurred about 10 p.m. when Border Patrol agents from the Clint station came under fire ...